An off-duty police officer stopped at a coffee shop for a cup of coffee. When he was in the back of the store, someone entered the front of the coffee shop carrying a gun. That person demanded the cash from the cash drawer. The officer stopped the robbery and arrested the suspect. It was later discovered that the suspect was wanted in another state and a reward of $20,000 had been offered for information leading to the suspect's arrest. When the officer heard of the reward, he attempted to collect the reward. The request to collect the reward was denied. The officer sued for the reward asserting a breach of a unilateral contract. Will he succeed?